Wanting short term distress to be relieved

This is my 1st post.
I have at times over my life had times like this but they pass and so I move on and have never really dealt with them. I'm generally a rational person and because I can look at each incident and see what happen and why I can't work out why my emotional response is out of proportion and irrational.
So today I was at my local grocery store. It was raining so I had put my handbag inside a shopping bag to keep it dry. While I was at the store I need to check my shopping list that was on my smart phone that was in my handbag. I stepped to one side got my phone out and then put it away again. I now realize that the some of the staff my have thought I was shoplifting.
After I had paid an older gent holding a box cutter, who was stopping me from leaving the store. After a bit of confusion on my part he finally said, "what's in your bag?" and finally I realized what was going on. I let him look in my handbag, which he did quite closely. When he didn't find anything stolen he shrugged his shoulders and gave a halfhearted sorry.
I gathered my purchases and bag and said, "I come here every day. I'm really offended." and walk off I could here him yelling a response but I was already on the verge of tears and was out of there fast.
Rationally I know it was all just a mistake. But every time I think about it I end up tears and I don't even know why. I wasn't doing anything wrong. They were just doing their job. Could they have handled it better probably, so could have I.
I have been crying about it of and on for 6 hours now. Why?!? The worst be is I know I'm going to be haunted by this incident for the next few days and I'll have flash backs about it during stressful periods in my life. It's so stupid and unimportant. I do suffer from mild social anxiety and I have been on edge for a few days anyway.
I have had a GP suggest antidepressants for me recently but I honestly don't think I'm depressed and I quite like my life most of the time. I really don't want to take a daily drug long term. Does anyone know or is on a drug on an as needed basis? I just want the short term distress to be relieved so I don't spend the next week alternating between obssessing about it, crying and then getting angry with my self. It's exhausting.
If you have made it this far, thanks for reading. Sorry for rambling.

hello,
I was like that ;-) and the antidote was 'being friendly' with that person ( who seemed intimidating ). That works for me until now, maybe that could work for both of you too ;-).

First of all, let me say that i am fascinated by Achenzo's post above. Gramatically a bit confusing, but there's a lot in there.

Secondly, Rivapossum, I have the exact same thing as you. There were many times that i have been frustrated at short interactions i've had with other people. Sometimes, people assumed i was trying to offend them while i was trying to be helpful. Other times, i feel i didn't stick up for myself enough or should have gotten angry at what clearly was an unfair or disadvantageous situation to me. Let me give you just one example that haunted me for some time.

Once, when i was about 3 or 4, i let the housemaid access the water faucet before me out of what i considered common courtecy: she was working, doing a job and i just wanted a glass of water or something, i don't remember. My parents observed this behavior and noted the polite intent, so asked me, smiling, why i let her go before me. Being a toddler, i couldn't express myself very clearly yet, so i might have said something along the lines of: "just, because she is cleaning" or maybe "because she is, just, cleaner". It doesn't matter. The point is that what I was trying to communicate and what the housemaid got out of it didn't correspond at all. She assumed i was insulting her and burst into a ranting tirade that cost her her job and was slightly traumatic for me.

Things like this always have a funny way of coming back to me. A month or so ago, almost twenty years after this incident, i was at work when i needed a glass of water. I went to the kitchen, where two women were cleaning. I excused myself for the intrusion and tried to communicate that i just needed to access the faucet to get a glass of water. One of the women took offense to this and assumed i wanted them to drop everything and get me a glass of water. She got quite angry, yet i stayed completely calm. I got a glass, filled it with water, and said to her: "You completely misunderstood me, madam. Have a nice day." while walking away.

Although it might seem completely random, this was actually an important moment for me: I realised that her frustration wasn't caused by me. I realised that she was unhappy because of something else and that i hadn't done anything wrong. And i also realised that it was simply not worth the time and effort to try to explain to this woman that, in principle, i respect everyone regardless of the kind of work they do. In fact, i respect cleaners and garbage men one hell of a lot more than i do some other professions.

What i'm trying to show you, Rivapossum, is that sometimes, people can just misunderstand each other. One person is just doing his job, another is just doing her groceries. You do what you need to do and he does what he thinks he needs to do. Obviously, sometimes this causes a minor conflict (such as when he assumes you're trying to rob the joint!) and one or both parties handles this poorly (like the clerk at the store, in this instance). LET IT GO. You didn't do anything wrong, and the guy was just unable to handle it in a way that didn't offend you. After all, if he was more able at interactions like that, he wouldn't be cutting boxes in a store, but might be selling automobiles or something. Its not worth thinking about again. Have a nice day and don't be afraid of visiting the store again. If you're feeling particularly big, give a smile to the old lad cutting the boxes. He's probably forgotten all about it and you'll make his day a bit less unpleasant.